Doubletree.



A. J. GRAY.

DOUBLETREE.

APPLICATION FILED JULY 21,1910.

1,055,269, Patented Mar. 4, 1913.

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ALMON J'. GRAY, OF ST. PAUL, MINNESOTA.

DOUBLETREE.

Specification of Letters Patent.

Patented Mar. 4, 1913.

Application filed July 21, 1910. Serial No. 573,079.

To all whom t may concern:

Be it known that I, ALMoN J. GRAY, of St. Paul, Ramsey county,Minnesota, have invented certain new and useful Improvements inDoubletrees, of which the following is a speciiication.

The object of my invention is to provide a doubletree of simple,economical construction and one whichwill withstand an eX- treme degreeof strain to which a device of this kind is often times subjected.

The invention consists generally in various constructions andcombinations, all as hereinafter described and particularly pointed outin the claims.

In the accompanying drawings forming part of this specification, Figure1 is a plan view of a double-tree embodying my invention, Fig. 2 is afront view of the same, Fig. 3 is a rear view, Fig. 4 is a sectionalView on the line :1a-m of Fig. 1.

In the drawing, 2 represents a Wooden bar forming the main portion ofthe doubletree and 3 a block which supplements the middle portion of thebar and extends lengthwise thereof. The bar and block are securedtogether by suitable means, such as the bolts 6, which pass through themfrom the front to the rear. A bushing 11 is mounted in the block 3 tocarry a draw-bolt or clevis pin for the purpose of attaching thedoubletree to the load. Brackets 12 are provided at the ends of the bar2 and have ears 13 thereon to receive the threaded ends of a truss rod14 which extends from end to end of the doubletree in the rear of theblock 3 and is seated in the outwardly turned ends 15 of a plate 16 thatis mounted on said block. Upon the truss rod 14, at each end thereof, Iprovide cushions consisting, preferably, of compression springs 17 and18, though rubber or any other suitable material may be used. A follower19 is slidably mounted on the truss rod at each end thereof, and a strap20 is arranged to bear on said follower at each end of the truss rod andhas its outer ends pivotally connected with al bell crank 21 that ispivoted at 22 on the bracket 12. The bell crank has holes or sockets 23therein in which the clevis 24: may be successively adjusted. When poweris applied to the clevis 24 the crank 21 will oscillate on its pivot,pull outwardly on the follower 19 and put the spring or other yieldingmeans under compression to relieve the shock or strain on thedoubletree.

I claim as my invention 1. A double-tree comprising a bar, a truss rodhaving its ends secured to the ends of said bar Vand extendinglengthwise thereof, springs carried by said rod, bell cranks mounted atthe ends of said bar, means slidable on said truss rod and adapted toengage said springs, said means being pivotally connected with said bellcranks, and draft clevises carried by said bell cranks.

2. A double-tree comprising a bar and a comparatively short wooden blocklitting the rear edge of said bar and extending across the middleportion thereof, means securing said bar and block together, a truss rodhaving its ends secured to the ends of said bar and extending lengthwisethereof in the rear of said block and having bearings on said block,springs carried by said truss rod, bell cranks mounted at the ends ofsaid bar, means slidable on said truss rod and pivotally connected withsaid bell cranks and draft clevises carried by said bell cranks.

3. A doubletree comprising a bar, a truss rod extending lengthwisethereof and -se cured thereto, yielding means mounted on said rod, bellcranks mounted at the ends of said bar, means slidable on said rod andadapted to engage said yielding means and pivotally connected with saidbell cranks, and draft clevises carried by said bell cranks.

4. A doubletree comprising a bar, a truss rod extending lengthwisethereof and secured thereto, yielding means carried by said rod, bellcranks mounted at the ends of said bar, means pivotally connected withsaid bell cranks and engaging said yielding means, and draft clevisesconnected to said bell cranks.

5. A doubletree comprising a bar, a truss rod extending lengthwise ofsaid bar and In Witness whereof, I have hereunto set secured thereto,bell cranks pvotally mountmy hand this 7 day 0f July 1910.

ed at the ends of said bar yielding means mounted 0n said truss roda,means t,slidahle ALMON J' GRAY' on said rod and engaging said yieldingWitnesses.:

means and pivotally connected with one arm GENEVIEVE E. SORENSEN,

of said bell cranks. J. A. BYRNEs.

Copies of this patent may be obtained for ve oents each, by addressingthe Commissioner of Patents,

Washington, D. C.

